公开(公告)号：FI961344A

公开(公告)日：1996-05-22

申请号：FI961344

申请日：1996-03-22

Applicant: QUALCOMM INC

Inventor： KINDRED DANIEL R ,  BUTLER BRIAN K ,  ZEHAVI EPHRAIM ,  WOLF JACK K

IPC: H04L1/12 ,  H03M13/23 ,  H03M13/37 ,  H03M13/41 ,  H04B1/707 ,  H04L1/00 ,  H04L1/08 ,  H04L1/20 ,  H04L25/02 ,  H04L25/03 ,  H04L25/08 ,  H04L25/40 ,  H04L13/12

Abstract: A Viterbi decoder for recovering the original bit data stream that was convolutionally encoded as a code symbol stream in a Code Division Multiple Access (CDMA) mobile communication system. The decoder simultaneously decodes at the several data rates associated with certain multirate vocoders. The decoder can decode at an unknown data rate in either continuous or framed packet modes. It accomplishes this by simultaneously decoding at multiple rates and by creating one or more data quality metrics for each decoded data packet. Special input and output buffering is provided to isolate the decoder from system timing constraints. The input buffer includes selection and accumulation logic to organize code symbol data into the packet order for repeat mode or random burst mode at lower frame data rates. Decoded data packets for each of several predetermined data transfer rates are held in an output buffer for about half of the decoding cycle, thereby permitting the system microprocessor to examine and select the appropriate decoded data packet. The decoder also can be reconfigured to operate at any one of several predetermined convolutional encoding algorithms. The Viterbi decoder, implemented as a single monolithic integrated circuit, can be used in any and all of many different multiuser telecommunications channels.

公开(公告)号：CA2263669C

公开(公告)日：2008-04-29

申请号：CA2263669

申请日：1998-06-16

Applicant: QUALCOMM INC

Inventor： ODENWALDER JOSEPH P ,  LEE CHONG U ,  WOLF JACK K ,  ZEHAVI EPHRAIM ,  VIJAYAN RAJIV

IPC: H04J11/00 ,  H04N21/2315 ,  H03M13/15 ,  H03M13/25 ,  H03M13/27 ,  H03M13/29 ,  H03M13/31 ,  H03M13/45 ,  H04J1/00 ,  H04J1/02 ,  H04L1/00 ,  H04L27/26 ,  H04N20060101 ,  H04N21/2383 ,  H04N21/438

Abstract: In an orthogonal frequency division multiplexing (OFDM) system (10) which uses an outer Reed-Solomon encoder and interleaver (24) and an inner convolutional encoder (26), after the inner convolutional encoding the data bits are interleaved by an inner interleaver (28), and then grouped into symbols, each symbol having "m" bits. After grouping, the symbols are mapped to a complex plane using quadrature amplitude modulation (QAM). Thus, bits, not symbols, are interleaved by the inner interleaver (28). A receiver (12) performs a soft decision regarding the value of each bit in each complex QAM symbol received.

公开(公告)号：DE69637106T2

公开(公告)日：2008-01-31

申请号：DE69637106

申请日：1996-04-22

Applicant: QUALCOMM INC

Inventor： ZEHAVI EPHRAIM ,  WOLF JACK K ,  SCHIFF LEONARD N

IPC: H04L12/56 ,  H04B7/15 ,  H04J3/24 ,  H04J11/00 ,  H04J13/00 ,  H04L1/00 ,  H04L12/28 ,  H04W72/04

Abstract: A variable rate transmission system wherein a packet of variable rate data generated by a variable rate data source is modulated on traffic channel by traffic channel modulator if the capacity of the traffic channel is capable of transmitting the packet. And where the packet of variable rate data is modulated onto traffic channel by traffic channel modulator and at least one overflow channel by traffic channel modulator, if the capacity of the traffic channel is less than required to transmit the packet. A receiving system for receiving variable rate data transmitted in accordance with the above.

公开(公告)号：DE69637106D1

公开(公告)日：2007-07-12

申请号：DE69637106

申请日：1996-04-22

Applicant: QUALCOMM INC

Inventor： ZEHAVI EPHRAIM ,  WOLF JACK K ,  SCHIFF LEONARD N

IPC: H04L12/56 ,  H04B7/15 ,  H04J3/24 ,  H04J11/00 ,  H04J13/00 ,  H04L1/00 ,  H04L12/28 ,  H04W72/04

Abstract: A variable rate transmission system wherein a packet of variable rate data generated by a variable rate data source is modulated on traffic channel by traffic channel modulator if the capacity of the traffic channel is capable of transmitting the packet. And where the packet of variable rate data is modulated onto traffic channel by traffic channel modulator and at least one overflow channel by traffic channel modulator, if the capacity of the traffic channel is less than required to transmit the packet. A receiving system for receiving variable rate data transmitted in accordance with the above.

公开(公告)号：MY121893A

公开(公告)日：2006-03-31

申请号：MYPI9601250

申请日：1996-04-03

Applicant: QUALCOMM INC

Inventor： ZEHAVI EPHRAM ,  WOLF JACK K ,  SCHIFF LEONARD N

IPC: H04B7/15 ,  H04J3/24 ,  H04J11/00 ,  H04J13/00 ,  H04L1/00 ,  H04L12/28 ,  H04L12/56 ,  H04W72/04

Abstract: THE PRESENT INVENTION DISCLOSE A VARIABLE RATE TRANSMISSION SYSTEM WHEREIN A PACKET OF VARIABLE RATE DATA OF A DATA RATE IS TRANSMITTED ON TRAFFIC CHANNEL IF THE CAPACITY OF SAID TRAFFIC CHANNEL IS GREATER THAN OR EQUAL TO SAID DATA RATE SAID PACKET AND WHEREIN A PACKET OF VARIABLE RATE DATA IS TRANSMITTED ON TRAFFIC CHANNEL AND AT LEAST ONE OVERFLOW CHANNEL IF THE CAPACITY OF SAID TRAFFIC CHANNEL IS LESS THAN SAID DATA RATE. THE PRESENT INVENTION FURTHER DISCLOSES A RECEIVING SYSTEM FOR RECEIVING VARIABLE RATE DATA WHEREIN A RECEIVED PACKET OF VARIABLE RATE DATA IS RECEIVED ON TRAFFIC CHANNEL IF THE CAPACITY OF SAID TRAFFIC CHANNEL IS GREATER THAN OR EQUAL TO A DATA RATE OF SAID PACKET AND WHEREIN A PACKET OF VARIABLE RATE DATA IS RECEIVED ON TRAFFIC CHANNEL AND AT LEAST ONE OVERFLOW CHANNEL IF THE CAPACITY OF SAID TRAFFIC CHANNEL IS LESS THAN SAID DATA RATE.FIG.2

公开(公告)号：MY119818A

公开(公告)日：2005-07-29

申请号：MYPI9802729

申请日：1998-06-18

Applicant: QUALCOMM INC

Inventor： RAJIV VIJAYAN ,  ODENWALDER JOSEPH P ,  WOLF JACK K ,  EPHRAIM ZEHAVI ,  LEE CHONG U

IPC: H04N21/2315 ,  H03M13/15 ,  H03M13/25 ,  H03M13/27 ,  H03M13/29 ,  H03M13/31 ,  H03M13/45 ,  H04J11/00 ,  H04L1/00 ,  H04L27/26 ,  H04N20060101 ,  H04N21/2383 ,  H04N21/438

Abstract: IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) SYSTEM (10) WHICH USES AN OUTER REED-SOLOMON ENCODER AND INTERLEAVER (24) AND AN INNER CONVOLUTIONAL ENCODER (26), AFTER THE INNER CONVOLUTIONAL ENCODING THE DATA BITS ARE INTERLEAVED BY AN INNER INTERLEAVER (28), AND THEN GROUPED INTO SYMBOLS, EACH SYMBOL HAVING "M" BITS. AFTER GROUPING, THE SYMBOLS ARE MAPPED TO A COMPLEX PLANE USING QUADRATURE AMPLITUDE MODULATION (QAM). THUS, BITS, NOT SYMBOLS, ARE INTERLEAVED BY THE INNER INTERLEAVER (28). A RECEIVER (12) PERFORMS A SOFT DECISION REGARDING THE VALUE OF EACH BIT IN EACH COMPLEX QAM SYMBOL RECEIVED.FIG. 2

公开(公告)号：AU2003200323B2

公开(公告)日：2005-05-05

申请号：AU2003200323

申请日：2003-02-03

Applicant: QUALCOMM INC

Inventor： LEE CHONG U ,  ZEHAVI EPHRAIM ,  WOLF JACK K ,  ODENWALDER JOSEPH P ,  VIJAYAN RAJIV

IPC: H04N007/24

公开(公告)号：HK1046795A1

公开(公告)日：2003-01-24

申请号：HK02108158

申请日：2002-11-11

Applicant: QUALCOMM INC

Inventor： ROSE GREGORY G ,  BENDER PAUL E ,  QUICK ROY FRANKLIN JR ,  WOLF JACK K

IPC: G09C1/00 ,  H04L9/32 ,  H04Q7/38 ,  H04L

Abstract: A method for generating a message authentication code (MAC) includes the steps of distributing the bits of a message into a larger message in accordance with a pseudorandom number distribution format. The cyclic redundancy check (CRC) bits of the larger message are computed and used as the MAC for the message. The larger message need not be created. The remainder modulo the CRC polynomial of a polynomial x , where i is the intended bit position in the "larger message", is calculated. An exclusive-OR(XOR) operation is performed, bit by bit, on the CRC and the calculated remainder to derive the new CRC.

公开(公告)号：BR9714208A

公开(公告)日：2000-03-28

申请号：BR9714208

申请日：1997-12-19

Applicant: QUALCOMM INC

Inventor： WOLF JACK K

IPC: H03M13/15 ,  H03M13/29 ,  H03M13/41 ,  H03M13/47 ,  H04L1/00 ,  H04L1/16 ,  H03M13/00

Abstract: In a concatenated code data, correctly decoded code words from a block decoder is utilized to improve the performance of the convolutional decoder. A code word can sometimes be correctly decoded prior to receipt of all the symbols for the code word. Early decoding of the code word allows for the correct recreation of the entire code word, even the symbols which have not yet been received. The entire corrected code word is used by the convolutional decoder to eliminate branches the trellis, thus improving decoding of prior data bits and future data bits in the trellis. The chain back distance of the convolutional decoder can also be made shorter based on the knowledge that some of the received code words have been correctly decoded. Finally, the parity symbols which have not yet been received for the correctly decoded code word can be eliminated from transmission to improve the overall transmission rate.

公开(公告)号：HK1019022A1

公开(公告)日：2000-01-14

申请号：HK98113757

申请日：1998-12-16

Applicant: QUALCOMM INC

Inventor： ANTONIO FRANKLIN P ,  GILHOUSEN KLEIN S ,  WOLF JACK K ,  ZEHAVI EPHRAIM

IPC: H01Q3/26 ,  H04B1/7085 ,  H01Q3/24 ,  H04B1/7117 ,  H04B1/712 ,  H04B7/26 ,  H04L1/06 ,  H04W16/28 ,  H04B ,  H04Q

Abstract: A system and method for adaptively sectorizing channel resources within a digital cellular communication system is disclosed herein. The system includes an antenna arrangement for providing at least first and second electromagnetic beams for receiving a first information signal transmitted by a specific one of a plurality of users, thereby generating first and second received signals. A first set of beam-forming signals are then generated from the first and second received signals. A demodulating receiver is provided for demodulating at least first and second beam-forming signals included within the first set of beam-forming signals, thereby producing first and second demodulated signals. The system further includes a tracking network for tracking multipath information signals, received from various positions and angles of incidence, based on comparison of the first and second demodulated signals.